Volvo Penta Stage IV/Tier 4 Final Emission Technology
Selective Catalytic Reduction (SCR) is our technology of choice for industrial engines to meet the legislative demands for Stage IV/EPA Tier 4 Final. This solution not only means less maintenance and upkeep for customers, it also means better productivity and uptime. Together with a light Exhaust Gas Recirculation (EGR) system, the diesel engines stand ready to meet these emission standards with a well-proven technology.
BENEFITS OF THE VOLVO PENTA SOLUTION
A number of benefits and advantages come when choosing the SCR solution to meet the Stage IV/Tier 4 Final emission legislation. From easier installation to fuel savings, there are many benefits for OEMs and end users
A diesel engine with the Volvo SCR system has the same – or lower – cooling demand compared to one without SCR. Lower cooling demands results in lower noise levels and minimized costs for the radiator package. This all enables manufacturers to house the cooling system in installations where space is limited.
MAXMIZED POWER OUTPUT
Our advanced combustion technology combined with the SCR system turns more fuel energy into mechanical power. This leads to less heat rejection, and means that the power output can be maximized for any given engine displacement. The result is smaller engine sizes, reduced fuel costs and easier installations to give OEMs and end users simplified ownership.
REDUCED OVERAL COSTS
For end users, the principal benefits of the SCR engines start with unsurpassed diesel fuel efficiency that significantly cuts operating costs. With this system, where the catalytic converter is designed to last the life of the engine, costs for maintenance and downtime are also reduced. This lowers the total cost of ownership.
Common Questions about Stage IV/Tier 4 Final Engines
1. Are Stage IV/Tier 4 Final engines proven in the field?
Stage IV/Tier 4 Final regulations on large bore stationary engines are still relatively new to the market, but the Volvo Penta solution has been proven and tested. Volvo Group pioneered implementation of SCR as part of the total solution for over-the-road trucks in this North America in 2010 and Volvo Penta remains in a position to leverage this proven technology that has been deployed in more than 270,000 (need to confirm still valid) Volvo Group trucks in the region.
2. What impact do Stage IV/Tier 4 Final engines have on total cost of ownership?
When considering a Stage IV/Tier 4 Final solution, it is important to look at the total cost of ownership.
The PowerSecure and Volvo Penta package promises unmatched fuel efficiency, lowered maintenance costs and reduced downtime. With the SCR system, where the catalytic converter is designed to last the life of the engine, costs for maintenance and downtime are also reduced. This is all combined with PowerSecure’s service schedule and monitoring offerings for a seamless overall experience.
3. Are all Stage IV/Tier 4 Final engines are equip with Diesel Particulate Filters?
Some competitive Stage IV/Tier 4 Final engines on the market were configured in a way that produced low levels of NOx, but at the same time emitted high levels of PM. The solution was to add a diesel particulate filter (DPF) to capture the particles and intermittently incinerate it down to ash. The process is known as regeneration, and results in downtime and high fuel consumption. Furthermore, a DPF system comes with higher maintenance costs and must be replaced regularly.
While most engine manufacturers installed a DPF to meet Stage IV/Tier 4 Final requirements, Volvo Penta put all their efforts into improving the SCR technology instead and did not need to install a DPF to meet Stage IV/Tier 4 Final regulations. The Volvo Penta SCR solution means less maintenance and upkeep for customers, as well as better productivity and uptime and lower maintenance costs.
4. What is the difference in Stage IV/Tier 4 Final fuel efficiency comparison to earlier tier levels?
Stage IV/Tier 4 Final engines are more fuel efficient than previous tier levels due to the precise control of fuel/air mixture that is controlled by the Engine Control Module. The Stage IV/Tier 4 Final engines utilize additional information from key sensors to provide better fuel control. Due to reducing the PM in the engine and the NOx with the SCR system, there is no cooled EGR used which further reduces fuel consumption and improves reliability.
5. How does the lifetime of new engines compare?
Today’s modern Stage IV/Tier 4 Final engines are developed using the latest materials and engineering techniques and designed to run longer.
The combination of SCR, non-cooled Exhaust Gas Recirculation (EGR) and an air throttle system help to reduce the amount of NOx emitted by the engine. The air throttle controls the amount of air entering the engine, which in turn affects the exhaust temperature that determines how much particulate matter is burnt off during SCR. The throttle closes partially during light loading to maintain the necessary engine temperature for meeting those requirements. Together, these elements provide a simple solution for Stage IV/Tier 4 Final, while helping to reduce wear in the engine over time, and preventing the need for downtime.
6. Do Stage IV/Tier 4 Final engines perform as well in cold weather climates?
The Volvo Penta Stage IV/Tier 4 Final engines are designed to operate in all climates. The standard engine will start without the need of start aid assistance down to single digits. All provisions have been made to heat DEF fluid in very cold climates and make operation seamless for operators. In fact, Volvo Penta Stage IV/Tier 4 Final engines perform exactly the same in cold temperatures as previous emission step engines.
7. Are Stage IV/Tier 4 Final engines more complex and require more maintenance?
The Volvo Penta Stage IV/Tier 4 Final engine requires the same amount of maintenance as previous iterations.
Emissions are reduced by means of SCR technology. There are many ways to build an SCR system. Volvo Penta kept their SCR as simple and reliable as possible. While others have chosen more complex installations and C-EGR (cooled exhaust gas recirculation) systems – Volvo Penta only two parts: SCR and non-cooled EGR. The benefits are obvious: the fewer components used, the less risk of part failure or system malfunction. In addition, the Volvo Penta SCR catalyst is maintenance free.
8. Natural gas engines compared to diesel engines.
The comparison of natural gas vs. diesel fuel as a source is most certainly the choice of the consumer based on specific needs. Here are a few points in support of diesel engines:
a) Diesel fuel provides more efficiency and power by volume in comparison to natural gas. With the Volvo Penta Stage IV/Tier 4 Final application, the design has built-in efficiencies that meet stringent emissions requirements that reduce both PM and NOx levels. Natural gas engines emit carbon dioxide as a result of combustion.
b) Natural gas is cleaner burning fuel but often requires much higher costs at build and start up. The natural gas equipment must be added to the diesel product as a complimentary system. This increases the initial costs of the project installation.